package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面类，用于实现公共字段自动填充处理
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {}
    /**
     * 前置通知，在目标方法执行前调用
     */
   @Before("autoFillPointCut()")
    public void beforeAutoFill(JoinPoint joinPoint) {
       log.info("开始进行公共字段自动填充...");
       //获取当前拦截到的类型
       MethodSignature signature = (MethodSignature) joinPoint.getSignature();//获得签名对象
       AutoFill annotation = signature.getMethod().getAnnotation(AutoFill.class);//获得注解对象
       OperationType value = annotation.value();//获得操作类型
       //获取到当前被拦截方法的参数---实体对象
       Object[] args = joinPoint.getArgs();
       if (args == null || args.length == 0) {
           return;
       }
       Object entity = args[0];
       //准备赋值数据
       LocalDateTime now = LocalDateTime.now();
       Long currentId = BaseContext.getCurrentId();
       //通过反射复制数据
       if (value == OperationType.INSERT) {
           try {
               Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
               Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
               Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
               Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
               //为属性赋值
               setCreateTime.invoke(entity, now);
               setUpdateTime.invoke(entity, now);
               setCreateUser.invoke(entity, currentId);
               setUpdateUser.invoke(entity, currentId);
           } catch (Exception e) {
               e.printStackTrace();
           }
       } else if (value == OperationType.UPDATE) {
           try {
               Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
               Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
               //为属性赋值
               setUpdateTime.invoke(entity, now);
               setUpdateUser.invoke(entity, currentId);
           } catch (Exception e) {
               e.printStackTrace();
           }
       }

   }
}
